diff --git a/test/Dockerfile-bash4-0 b/test/Dockerfile-bash4-0
index 9b1f790..0dae149 100644
--- a/test/Dockerfile-bash4-0
+++ b/test/Dockerfile-bash4-0
@@ -7,9 +7,9 @@ RUN apk --no-cache add supervisor openssl git curl bind-tools drill wget nginx l
 WORKDIR /root
 
 # Create nginx directories in standard places
-RUN mkdir /run/nginx
-RUN mkdir /etc/nginx/pki
-RUN mkdir /etc/nginx/pki/private
+RUN mkdir -p /run/nginx
+RUN mkdir -p /etc/nginx/pki
+RUN mkdir -p /etc/nginx/pki/private
 
 # Setup ftp
 ENV VSFTPD_CONF=/etc/vsftpd.conf
diff --git a/test/Dockerfile-bash4-2 b/test/Dockerfile-bash4-2
index d9386f6..dd1cb11 100644
--- a/test/Dockerfile-bash4-2
+++ b/test/Dockerfile-bash4-2
@@ -7,9 +7,9 @@ RUN apk --no-cache add supervisor openssl git curl bind-tools drill wget nginx l
 WORKDIR /root
 
 # Create nginx directories in standard places
-RUN mkdir /run/nginx
-RUN mkdir /etc/nginx/pki
-RUN mkdir /etc/nginx/pki/private
+RUN mkdir -p /run/nginx
+RUN mkdir -p /etc/nginx/pki
+RUN mkdir -p /etc/nginx/pki/private
 
 # Setup ftp
 ENV VSFTPD_CONF=/etc/vsftpd.conf
diff --git a/test/Dockerfile-bash5-0 b/test/Dockerfile-bash5-0
index 2d776eb..260290d 100644
--- a/test/Dockerfile-bash5-0
+++ b/test/Dockerfile-bash5-0
@@ -7,9 +7,9 @@ RUN apk --no-cache add supervisor openssl git curl bind-tools drill wget nginx l
 WORKDIR /root
 
 # Create nginx directories in standard places
-RUN mkdir /run/nginx
-RUN mkdir /etc/nginx/pki
-RUN mkdir /etc/nginx/pki/private
+RUN mkdir -p /run/nginx
+RUN mkdir -p /etc/nginx/pki
+RUN mkdir -p /etc/nginx/pki/private
 
 # Setup ftp
 ENV VSFTPD_CONF=/etc/vsftpd.conf
diff --git a/test/Dockerfile-centos7-dynu b/test/Dockerfile-centos7-dynu
index 09a1534..cabd7eb 100644
--- a/test/Dockerfile-centos7-dynu
+++ b/test/Dockerfile-centos7-dynu
@@ -17,8 +17,8 @@ ENV dynamic_dns "duckdns"
 #ENV DYNU_API_KEY 
 
 WORKDIR /root
-RUN mkdir /etc/nginx/pki
-RUN mkdir /etc/nginx/pki/private
+RUN mkdir -p /etc/nginx/pki
+RUN mkdir -p /etc/nginx/pki/private
 COPY ./test/test-config/nginx-ubuntu-no-ssl /etc/nginx/conf.d/default.conf
 COPY ./test/test-config/nginx-centos7.conf /etc/nginx/nginx.conf